Comparison of three methods for measuring pressure-volume curves in patients with acute respiratory failure
DOI:
https://doi.org/10.22491/2357-9730.125245Keywords:
Acute respiratory failur, acute respiratory distress syndrome, pressurevolume curves, static compliance, lower inflection poin, upper inflection pointAbstract
OBJECTIVE: Measurement of respiratory compliance based on pressure-volume curves are advocated for assessing the severity of acute respiratory failure. The
aim of the present study was to compare different methods of obtaining pressure volume curves and to evaluate their reproducibility and reliability.
MATERIALS AND METHODS: Thoracopulmonary, pulmonary and thoracic pressurevolume curves were obtained in 14 patients and compared using three different methods: supersyringe method, inspiratory occlusions method and constant-flow method, using two different flows: 3 and 9 l.min-1. The slope of the curves, the values of static compliance and upper and lower inflection points, when present, were evaluated.
RESULTS: The analysis of the pressure-volume curves through the three different methods showed that the curves obtained using a constant 3 l.min-1 flow were
superimposable to the ones obtained using the supersyringe and inspiratory occlusions. Curves obtained using the 9 l.min-1 flow method were associated with a
slight rightward shift. However, the values of static respiratory compliance and lower inflection points were similar for all patients regardless of the method, allowing the identification of patients with and without lower inflection points.
CONCLUSIONS: The evaluation of pressure-volume curves, by any of the tested methods, in patients with acute respiratory failure, allows the evaluation of the values of static respiratory compliance and points of lower inflection, as well as their division into two groups, according to the presence or absence of points
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